The vospace-backend is a storage service management used at OATs to interface a CADC VOSpace interface implementation with a storage solution. This software module persists the information linking a VOSpace Node Identifier with a vospace backend stored file, so it is able to return URIs to access the content of the data objects. The storage solution can be changed thanks to a plug-in architecture allowing to plug-in at run time different storage solutions simply implementing an abstract java class.The current software provides support for a posix file system storage solution.The service requires an SQL Resource DataBase Management Service (RDBMS) as default built-inpersistence layer and it provides a RESTful interface.This guide explains how to install, configure, deploy and run the VOSpace Backend Service, freely available at https://github.com/oats-cadc and it contains also instructions on Tomcat Web Server and RDBMS installation and configuration.